*Interlobular ducts run in the tissue septum lined by cuboidal to columnar epithelium
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*Intralobular ducts run within the lobules. Striated intralobular ducts lined with cuboidal epithelium. Intercalated intralobular ducts lined with low cuboidal to simple squamous epithelium.
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*Serous acini secrete a watery solution rich in proteins with spherical nuclei. Cells are pyramidal, cuboidal or crescent shaped.